I read from a web that to pronounce ch[ʧ] in cheek and j[ʤ] in juice, the front part of the tongue raises and touches the roof of the mouth in the t/d tongue position when they say ch/j sound. Is it correct?
And as native English speaker do you think it is correct if the middle of the tongue (not the front) is touching the roof of the mouth to pronounce those sounds?